First off, CA is a glue, not a finish!
It normally has no UV protection for itself not the timber under it, so will craze and yellow in sunlight expected life in daylight situations about 6 months. Also it is plastic... if you want a pen that feels like plastic why not turn acrylic?
I do use it, on Xmas tree baubles it gives a nice shine, They live in a box in the attic 50 weeks a year UV is not an issue, and are for looking at not touching so plastic is not an issue.
Carnauba, feels better not quite as shiny and high enough melting point to withstand signing typed documents without marking. Will probably get finger prints if you use it to write a book though.
Have you thought about an oil?